Tlt 3.0 supports training on multiple resolutions

Accelerated Computing Intelligent Video Analytics TAO Toolkit
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Update:
In latest TLT 3.0-py3 version , detectnet_v2 does not need to resize images offline. TLT provides below ways for end user.
See https://docs.nvidia.com/tlt/tlt-user-guide/text/object_detection/detectnet_v2.html#input-requirement

The train tool does not support training on images of multiple resolutions. However, the dataloader does support resizing images to the input resolution defined in the specification file. This can be enabled by setting the enable_auto_resize parameter to true in the augmentation_config module of the spec file.